United States. Department of Transportation (1930). Street Traffic Signs, Signals, and Markings. United States. Department of Transportation. https://doi.org/10.21949/1510370
United States. Department of Transportation. Street Traffic Signs, Signals, and Markings. United States. Department of Transportation, 1930. https://doi.org/10.21949/1510370.
United States. Department of Transportation Street Traffic Signs, Signals, and Markings. United States. Department of Transportation, 1930, ROSA P. https://doi.org/10.21949/1510370.
The object of this survey has been to determine the existing best practice in the use of street traffic signs, signals, and markings in all American cities having a population of 50,000 or more and in some selected smaller cities in which exceptional conditions have necessitated the adoption of exceptional practices that are worthy of consideration, and to formulate recommendations for the establishment of better and more uniform practice as a means of increasing safety and facilitating traffic on city streets.
United States. Department of Transportation (1930). Street Traffic Signs, Signals, and Markings. United States. Department of Transportation. https://doi.org/10.21949/1510370
United States. Department of Transportation. Street Traffic Signs, Signals, and Markings. United States. Department of Transportation, 1930. https://doi.org/10.21949/1510370.
United States. Department of Transportation Street Traffic Signs, Signals, and Markings. United States. Department of Transportation, 1930, ROSA P. https://doi.org/10.21949/1510370.
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